This
problem occurs due to registry errors , fragmentation problems System
clutters etc.

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1 Suggested Answer

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This is not the problem of drivers it is the problem with the memory when one or more programmes try to occupy the same ram space at the same time if you want to get rid of this problem i suggest you to format your pc once and reload the os.

This could be pretty complex.The ATAPI.SYS file controls the Hard Drive and CD-Rom Drive.I would recommend reading this MS TechNet article:http://support.microsoft.com/kb/822051/The article says that it's not uncommon for the problem to be caused by faulty memory or by problems in the mass storage controller subsystem, which makes sense since atapi.sys (a mass storage controller system file) is noted.
If you have multiple memory cards in the machine, it might not be a bad idea to take one out and try again.If the fails, keep swapping out memory cards until we either solve the problem, or elimite that as a cause.